Across
- 3. present in a chemical reaction
- 5. it's the powerhouse of the atom
- 8. has no electric charge
- 9. The outermost electron
- 11. conductors of electricity
- 12. a substance from when two or more chemicals are bonded
- 14. the number of protons in an atom
- 17. created the periodic table
- 20. the mass of an atom
- 21. h20
- 23. smallest particle in a chemical element
- 24. horizontal row of elements on the P.T
- 25. column of elements on the P.T
Down
- 1. the recombination of atoms
- 2. made by Mikhail Lomonsov
- 4. chemical reactions that is accompanied by the absorption of heat
- 6. not able to conduct electricity or heat well
- 7. has a positive charge
- 10. makes up matter
- 13. any elements in group O
- 15. The pattern of an atom
- 16. a chemical element in the middle of typical metals and non-metals
- 18. releases energy by light or heat
- 19. cannot be chemically interconverted or broken down
- 22. an outer coating of other metals